Geology for ELR BTH1 is based on British Geological Survey (BGS) low-resolution data sampled at 100 metre intervals along the ELR. The geology presented should not be treated as accurate or complete. Data marked with Ⓤ is classed as undifferentiated by the BGS.
| Mileage | Material | Deposit | Bedrock |
|---|---|---|---|
| 1M 1065y to 1M 1082y | Clay, Silt and Sand | Alluvium | Thanet Sand Formation - Sand, Silt and Clay |
| 1M 1082y to 2M 0165y | Clay, Silt and Sand | Alluvium | White Chalk Subgroup - Chalk |
| 2M 0165y to 2M 1045y | Clay, Silt and Sand | Alluvium | Thanet Sand Formation - Sand, Silt and Clay |
| 2M 1045y to 2M 1265y | Sand and Gravel | River Terrace Deposits Ⓤ | Lambeth Group - Clay, Silt, Sand and Gravel |
| 2M 1265y to 2M 1595y | Sand and Gravel | River Terrace Deposits Ⓤ | Thanet Sand Formation - Sand, Silt and Clay |
| 2M 1595y to 3M 0715y | Sand and Gravel | River Terrace Deposits Ⓤ | Lambeth Group - Clay, Silt, Sand and Gravel |
| 3M 0715y to 3M 1155y | Lambeth Group - Clay, Silt, Sand and Gravel | ||
| 3M 1155y to 4M 0165y | Thames Group - Clay, Silt, Sand and Gravel | ||
| 4M 0165y to 5M 1045y | Lambeth Group - Clay, Silt, Sand and Gravel | ||
| 5M 1045y to 8M 1375y | Thames Group - Clay, Silt, Sand and Gravel | ||
| 8M 1375y to 11M 1375y | Sand and Gravel | River Terrace Deposits Ⓤ | Thames Group - Clay, Silt, Sand and Gravel |
| 11M 1375y to 12M 1045y | Sand and Gravel | River Terrace Deposits Ⓤ | Lambeth Group - Clay, Silt, Sand and Gravel |
| 12M 1045y to 12M 1485y | Sand and Gravel | River Terrace Deposits Ⓤ | Thanet Sand Formation - Sand, Silt and Clay |
| 12M 1485y to 13M 0495y | Sand and Gravel | River Terrace Deposits Ⓤ | White Chalk Subgroup - Chalk |
| 13M 0495y to 13M 0986y | White Chalk Subgroup - Chalk |